Which cable type is appropriate for a non-power-limited circuit?

Which cable type is appropriate for a non-power-limited circuit?

• A. Nplf
• B. Nmb
• C. THHN
• D. NM

Answer: (A)

Non-power-limited circuits in fire alarm systems require a cable that is specifically listed for that service. NPLF, or Non-Power-Limited Fire Alarm Cable, is designed for these circuits. It has conductors with insulation and a fire-retardant jacket that meet listing requirements for fire alarm installations, ensuring safe operation and compliance with fire codes when the circuit isn’t power-limited. The other options don’t fit because they are general-purpose or single-conductor products not listed for non-power-limited fire alarm use: NM (nonmetallic sheathed) is typical for residential branch circuits in dry locations, not fire alarm wiring; THHN refers to individual conductors used in conduit rather than a cable assembly; NM-B (the common form of NM) is intended for general building wiring, not for non-power-limited fire alarm circuits.

Non-power-limited circuits in fire alarm systems require a cable that is specifically listed for that service. NPLF, or Non-Power-Limited Fire Alarm Cable, is designed for these circuits. It has conductors with insulation and a fire-retardant jacket that meet listing requirements for fire alarm installations, ensuring safe operation and compliance with fire codes when the circuit isn’t power-limited.

The other options don’t fit because they are general-purpose or single-conductor products not listed for non-power-limited fire alarm use: NM (nonmetallic sheathed) is typical for residential branch circuits in dry locations, not fire alarm wiring; THHN refers to individual conductors used in conduit rather than a cable assembly; NM-B (the common form of NM) is intended for general building wiring, not for non-power-limited fire alarm circuits.